Question

解方程!5X－2*0.8＝33.42（X－7.5）＝181.8X＝0.8＝20.8啊，抱歉，最后是：1.8＋0.8X＝2

Answer 1

5X－2*0.8＝33.4,

5X=33.4+1.6,

5X=35,

X=7;

2（X－7.5）＝18 ,

2X-15=18,

2X=18+15,

2X=33,

X=33/2;

应该是"1.8X+0.8＝20.8"吧?(可能是把加号写成了等号了,因为加号是等号的上档键)

1.8X+0.8＝20.8,

1.8X=20.8-0.8,

1.8X=20,

X=20/1.8,

X=20*(5/9)=100/9.